Start by preheating the oven to 350 degrees F. Line an 8x8 baking dish with parchment paper and set aside.
In a medium bowl, add the wet ingredients: natural peanut butter, coconut palm sugar, vanilla extract and plant-based milk. Whisk very well.
Next, add the dry ingredients (minus the chocolate chips and marshmallows) to the bowl: oat flour, baking powder, baking soda and mineral salt. Mix well with a spatula.
Then, fold in the vegan chocolate chips and marshmallows.
Add the batter to the prepared baking dish, top with more vegan marshmallows and chocolate chips (gently press the marshmallows into the batter), and bake on the center rack for about 23 to 25 minutes or until a toothpick inserted comes out clean. I use a glass dish- if you are using a darker metal pan, check on these bars sooner because they will bake quicker in a metal pan.
Let this cool for a while in the pan (about 30-40 minutes), then slice into bars and top with graham crackers right before serving. It is very important to make sure the bars have cooled before you slice them as they are very fragile when hot. Don't worry, the marshmallows will stay nice and soft!
I like to store these covered on the counter so they stay super soft, but you can also store them in the fridge. Enjoy!